1. acerbity Acerbity is a sharpness, with a touch of bitterness, which may arise from momentary annoyance or habitual impatience; asperity is keener and more pronounced, denoting distinct irritation or v Synonyms: acrimony, acerbity, harshness, severity, tartness, asperity, malignity, sharpness, unkindness, bitterness, moroseness, sourness, virulence, causticity Antonyms: amiability, gentleness, kindness, smoothness, courtesy, good nature, mildness, sweetness